Re: [MW:34374] REGARDING ISSUE IN MONEL 400 TUBE TO TUBESHEET JOINT WELDING

Welder skill is very important, Too much current,

THANKS & BEST REGARDS,

KG.PANDITHAN, BE, IWE,  CSWIP 3.1,

ISO 9712 Level 2 in VT,

ASNT-Level II in PT,MT,RT & UT,

LA ISO 9001-2015,

International Welding Engineer. 

CONSULTANT-WELDING & QUALITY

Mobile no: +919940739349

On Tue, Jul 4, 2023 at 10:07 AM Saurabh Joshi <saurabh.joz30@gmail.com> wrote:

Dear All, 

       We are facing cracking  of tube ends , dis-bonding between tube base material and filler material during welding in Monel 400 Tube to Tubesheet Joints. Refer attached photographs.

Tube MOC: SB-163 UNS-N04400; 25.0 mm OD x 2.0 mm thk

Tube sheet MOC: SA-336M Gr F304L + SB-127 UNS-N04400 (48 + 10 mm thick clad by Explosion Bonding)

Welding: ERNiCu-7 GTAW filler size 2.0mm  with Argon shielding gas.

Kindly share the reason for such cracking, disbonding  and Suggest Corrective and preventive actions regarding this issue.

Thanks in Advance.

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